問題文
An IPv6 sparse-mode domain has to carry one rendezvous point address on two devices, so that a receiver reaches whichever of the two lies nearer to it. A colleague says that the source discovery protocol has to be brought into the design before the two devices can share the address. Which reading is correct?
選択肢
- The shared address holds with PIM by itself, and the set of the other devices is learned from the bootstrap messages of the domain rather than written by hand, so the list is built for the device by the domain itself.
- The shared address holds with PIM by itself, and a set of this kind takes two devices, so a third device that has to serve the same groups is given a range of its own instead.
- The shared address holds with PIM by itself, with the other devices of the set written into the device a line apiece up to fifteen of them, so the source discovery protocol stays out of the design.
- The shared address needs the source discovery protocol beside PIM on both of the devices, because the sources that one of them learns reach the other device in the messages that the discovery protocol carries across the domain.